#ifndef _RECOMMANDER_H_
#define _RECOMMANDER_H_

#include<string>
#include<string.h>
#include<fstream>
#include<iostream>
#include<vector>
#include<unordered_map>
#include<unordered_set>

using std::string;
using std::vector;
using std::unordered_map;
using std::unordered_set;

class Recommander
{
public:
     virtual string recommander(const string &)=0;
private:

};
#endif
